laravel_package_service_provider.php

<?php

namespace Mgsmus\MyPackage\Providers;

use Illuminate\Support\Facades\Event;
use Illuminate\Support\ServiceProvider;

class MyPackageServiceProvider extends ServiceProvider
{
    /**
     * Register services.
     *
     * @return void
     */
    public function register()
    {
        $this->app->register(MypackageEventServiceProvider::class);
    }

    /**
     * Bootstrap services.
     *
     * @return void
     */
    public function boot()
    {
        // ...
    }
}